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Considering increasing number of hybrid and electric vehicles, a growing number of car-pedestrian accident become a problem because these vehicles are virtually silent at low speeds where tire noise is not significant. To cope with this problem, a real-time approaching vehicle detection technique for pedestrians using acoustic digital communication is proposed. In this technique, a vehicle transmits...
Visible light communication (VLC) offers the usage of visible light for data transmission as well as illumination, and is suitable for vehicle-to-vehicle/infrastructure-to-vehicle communication. However, existing VLC systems require high-speed camera to achieve high data rate. To achieve VLC with sufficient data rate using commercial devices (e.g., smartphones), VLC using low-speed image sensor and...
In this paper, a secure acoustic communication system using a loudspeaker, vibration motor and microphone is proposed. The transmitter (smartphone) transmits an encrypted message and the encryption key from the loudspeaker and the vibration motor, respectively. While the sound emitted from the loudspeaker propagates long distances, the vibration emitted from the vibration motor propagates short distances...
Visible light communication (VLC) is one of the key technologies in intelligent transport systems (ITS). To achieve high-speed and cost-effective communication, we previously proposed a new VLC system that combined a low-speed commercial image sensor and a polygon mirror. In this paper, we improve our VLC system for use in an outdoor environment by designing a data frame structure and noise reduction...
In this paper, we propose a new signal processing method for underwater ranging systems, which is based on signal processing methods for wireless mobile communication, to improve SNR characteristics without an iterative measurement. We also evaluated the performance of the proposed method using a propagation simulation. The obtained results suggest that the proposed method can improve SNR characteristics...
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